1990699860940 has 48 divisors (see below), whose sum is σ = 5058719652672. Its totient is φ = 642377097216.

The previous prime is 1990699860917. The next prime is 1990699860971. The reversal of 1990699860940 is 490689960991.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 1990699860940.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418211877 + ... + 418216636.

It is an arithmetic number, because the mean of its divisors is an integer number (105389992764).

Almost surely, 2^{1990699860940} is an apocalyptic number.

1990699860940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990699860940 is an abundant number, since it is smaller than the sum of its proper divisors (3068019791732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990699860940 is a wasteful number, since it uses less digits than its factorization.

1990699860940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836428546 (or 836428544 counting only the distinct ones).

The product of its (nonzero) digits is 68024448, while the sum is 70.

The spelling of 1990699860940 in words is "one trillion, nine hundred ninety billion, six hundred ninety-nine million, eight hundred sixty thousand, nine hundred forty".